Improvement in coal screens and slaters



l. BEADLE.

Goal-Screens and Slaters. V Patented Aug 4,1874.

U NITED STATES PATENT OFFICE.

IMPROVEMENT IN COAL SCREENS AND SLATERS.

Specification forming part of Letters Patent No. 153,738, dated August4, 1874; application filed April 30, 1874.

To all whom it may concern:

Be it known that 1, Jesse BEADLE, of Shickshinny, in the county ofLuzerne and State of Pennsylvania, have invented certain new and usefulImprovements in Goal-Screens; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and useit, reference being had to the accompanying drawings, which form part ofthis specification.

My invention relates to an improvement in coal-screens and it consistsin placing around the screen a cage of triangular bars, which extend atright angles to the length of the screen, and which bars serve toseparate the slate from the coal, as will be more fully describedhereafter.

The accompanying drawing represents a longitudinal section of myinvention.

a represents an ordinary coal-screen, which is secured to a revolvingshaft in the usual manner, by means of the arm'c. This screen is dividedinto sections, the first one, 13, of which is sufficiently fine toseparate the slack from the coal before the slating begins, and then thesections become coarser and coarser toward the end of the screen, so asto separate the different sizes of coal. Around the screen is place acage, (1, composed of annular bars, triangular in their cross-section,and having their "ertices pointing inward toward the center of thescreen, the spaces between the bars being of less width than the meshesof the corresponding part of the screen a, and

of the same width, or nearly so, as the meshes of the section nextpreceding it.

As the coal is poured into the screen, the slack is sifted out in thefirst section or sections, 2', before reaching that part where theslating process begins. As the coal reaches the various sections, aroundwhich the cage is placed, all the lumps of coal and pieces of slate thatare smaller than the meshes of the screen fall through upon the cagebeneath, the bars of which, having their sharp edges turned inward, havea constant tendency to turn the pieces of slate up upon their edges,when they at once slip through between the bars and escape, while thecoal, being of a size too large to fall between the bars, passes on tothe receptacle prepared for it.

Where it is desired to extend the screen to any length, and have itseparate a number of different sizes of coal, there will be suitableopenings made in the cage at the end of each section, to allow the coalto be discharged into its pocket.

I am aware that a screen composed of triangular bars is not new; butnever before has a cage of these bars been placed around the outside ofa screen for the purpose of slating the coal, as described.

Having thus described my invention, I claim- 1. A combined coal screenand slater, constructed and arranged in themanner described, consistingof the screen a i and cage d, the cage being composed of triangular barshaving their vertices turned inward, which extend around the screen atright angles to its length, substantially as shown and described.

2. The arrangement of slater-bars beneath or outside the coal-screen, inthe manner and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this13th day of April, 1874.

JESSE BEADLE.

Witnesses:

CHAS. A. BOONE, Geo. W. SMITH.

